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BUG: KCSAN: data-race in __filemap_remove_folio / filemap_write_and_wait_range

read-write to 0xffff888106588c18 of 8 bytes by task 6292 on cpu 1:
 page_cache_delete mm/filemap.c:147 [inline]
 __filemap_remove_folio+0x23d/0x330 mm/filemap.c:225
 __remove_mapping+0x341/0x460 mm/vmscan.c:1457
 remove_mapping+0x22/0x90 mm/vmscan.c:1490
 mapping_evict_folio mm/truncate.c:281 [inline]
 mapping_try_invalidate+0x286/0x3d0 mm/truncate.c:520
 invalidate_mapping_pages+0x27/0x30 mm/truncate.c:558
 ext4_dio_write_iter fs/ext4/file.c:640 [inline]
 ext4_file_write_iter+0x10f6/0x1200 fs/ext4/file.c:715
 do_iter_write+0x4b4/0x7b0 fs/read_write.c:860
 vfs_iter_write+0x56/0x70 fs/read_write.c:901
 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x8a/0xb0 fs/splice.c:1142
 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888106588c18 of 8 bytes by task 6298 on cpu 0:
 mapping_needs_writeback mm/filemap.c:628 [inline]
 filemap_write_and_wait_range+0x51/0x210 mm/filemap.c:677
 ext4_dio_write_iter fs/ext4/file.c:637 [inline]
 ext4_file_write_iter+0x1080/0x1200 fs/ext4/file.c:715
 do_iter_write+0x4b4/0x7b0 fs/read_write.c:860
 vfs_iter_write+0x56/0x70 fs/read_write.c:901
 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x8a/0xb0 fs/splice.c:1142
 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000000000000b -> 0x0000000000000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6298 Comm: syz-executor.0 Tainted: G        W          6.6.0-rc6-syzkaller-00039-g06dc10eae55b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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